Dehumidifier size information needed

Yes I just recently built a bigger room so now I am running 4-1000 and 2-600 in a 14x14 with 20-24 6' plants in soil. I have a I think a 1 gallon dehumidifier running that I bough from Wal-Mart and a 10,000 btu air conditioner in one wall. I been running both for a couple days now and my humidity is still at 70%. Wanted to start Pricing a proper unit but don't know what I should be looking for.
 
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